Iranian Journal of Ceramic Science & Engineering
1- Faculty of Materials and Manufacturing Processes, Malek Ashtar University of Technology
2- Department of Advanced Materials and new Technologies, Iranian Research Organization for Science and Technology ,m.saeedi@irost.ir
2- Department of Advanced Materials and new Technologies, Iranian Research Organization for Science and Technology ,
Abstract: (47 Views)
In this research, the effect of using two molar ratios of Al2O3:Y2O3 equal to 3:2 and 79.72:20.28 and also the amounts of CaO additive including 0.2, 0.4, 0.6 and 0.8 %wt. in each of the mentioned molar ratios of alumina to yttria have been studied on the properties of silicon carbide base composite sintered by pressureless sintering method. The silicon carbide powder used in this research is β-SiC type. In all samples, the total additive percentage was considered equal to 9 %wt. and the samples were sintered at 1900 ˚C for 1 hour in an argon atmosphere. The results show that using the molar ratio of alumina to yttria equal to 3:2 has created better properties than the molar ratio of alumina to yttria equal to 79.72:20.28. The highest bulk density and elastic module in the molar ratio of alumina to yttria of 3:2 is achieved in 0.6 %wt. of CaO and equal to 2.67 g/cm3 and 281.55 ± 4.5 GPa, respectively. Also, this properties for alumina to Yttria of 79.72:20.28 molar ratio is obtained in 0.4 %wt. of CaO and equal to 2.52 g/cm3 and 236.35 ± 5.1 GPa.
Keywords: silicon carbide (SiC), pressureless sintering, Al2O3 to Y2O3 molar ratio, and weight percentage of CaO.
Type of Study: Research |
Subject:
Structural Oxide and Non-Oxide Ceramics
Received: 2024/06/9 | Accepted: 2024/10/27
Received: 2024/06/9 | Accepted: 2024/10/27
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